Quantification of the Existence Ratio of Non-Adhesion Grain Boundaries and Factors Governing the Strength of Coke Containing Low-Quality Coal
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概要
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“Non-adhesion grain boundaries” are formed when low-quality coal grains do not adhere to other grains in the carbonization process because of the low dilation of coke. To better understand the effects of non-adhesion grain boundaries on coke strength, the relationship between the existence ratio of non-adhesion grain boundaries and coke strength was investigated quantitatively. The existence ratio of non-adhesion grain boundaries were measured quantitatively by observing the fracture cross-section of coke using scanning electron microscopy (SEM). Coke strength was measured with a diametral-compression test and an I-shape drum index test. As a result, non-adhesion grain boundaries increased with an increase in the blending ratio of low-quality coal. In particular, non-adhesion grain boundaries increased rapidly when the blending ratio of low-quality coal was over 50%. When the ratio was less than 50%, low-quality coals adhered to other caking coal. However, not many low-quality coals adhered to other caking coals when the ratio was over 50%. The tensile strength of coke was not affected by the porosity of coke. However, the tensile strength and the drum index were affected by the existence ratio of non-adhesion grain boundaries. Tensile strength decreased rapidly even for a few non-adhesion grain boundaries because significant defects caused a fracture in the diametral-compression test. However, the I-shape drum index decreased linearly with the existence ratio of the non-adhesion grain boundaries because many fractures occurred during 600 rotations in the drum. The strength of coke containing low-quality coal is governed by the existence ratio of non-adhesion grain boundaries rather than mean values such as the porosity of coke.
著者
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Nomura Seiji
Environment & Process Technology Center, Nippon Steel Corporation
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Shoji Masakazu
Department Of Chemical Engineering Tohoku University
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Saito Yasuhiro
Department Of Applied Physics Osaka University
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Aoki Hideyuki
Department Of Applied Microbial Technology Kumamoto Institute Of Technology
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KUBOTA Yukihiro
Environment & Process Technology Center, Nippon Steel Corp.
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ZHANG Xiaoqing
Department of Chemical Engineering, Graduate School of Engineering, Tohoku University
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YAMAZAKI Yoshiaki
Department of Chemical Engineering, Graduate School of Engineering, Tohoku University
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KANAI Tetsuya
Department of Chemical Engineering, Graduate School of Engineering, Tohoku University
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UCHIDA Ataru
Department of Chemical Engineering, Graduate School of Engineering, Tohoku University
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HAYASHIZAKI Hideyuki
Environment & Process Technology Center, Nippon Steel Corporation
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MIYASHITA Shigeto
Corporate Research and Department Laboratories, Sumitomo Metal Industries, Ltd.
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